/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-size: 15px;
  color: #333;
}

ul {
  list-style: none;
}

img {
  display: block;
}

a {
  text-decoration: none;
  color: #333;
}

button {
  border: none;
  background-color: transparent;
  outline: none;
  user-select: none;
  cursor: pointer;
}

button:active {
  opacity: 0.8;
}

table {
  border-collapse: collapse;
}